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Few things offer more visceral proof of the power of physics than a karate chop. Punch a brick with your bare hand, untutored in the martial arts, and you may break a finger. Punch it with the proper force, momentum, and positioning, and you'll break the brick instead.

"Amazingly, there are no tricks involved at all," says Michael Feld, a physicist at MIT. "What you have here is one of the most efficient human movements ever conceived. We've found nothing in our studies to improve upon the art."

Police said the mutually agreed upon fight between a 16-year-old and a 15-year-old to “settle their differences” led to the death of the older teen on Aug. 28 at Providence Regional Medical Center in Everett. Read more here.